Ricoh R5511x - 1-Ohm, 300 mA LDO with Reset | Ricoh Europe: copiers, photocopiers, printers, gelsprinters, multifunctional printers

Amstelveen, The Netherlands, July 2004 -- Ricoh Europe B.V., the European headquarters of Ricoh Company Ltd., Tokyo, announces the launch of R5511x combining an LDO and a voltage detector in one package. The product's 1-Ohm LDO regulator has a very low dropout voltage of only 0.1 V typical at Iout of 100 mA and has excellent low noise features with a high ripple rejection ratio of typical 75 dB at f = 1 kHz. The R5511x is a flexible product with a wide variety of options for the designer. The designer can select his preferred version for delay time, hysteresis, sense pin option for the voltage detector, output type and package type. Ricoh R5511x can be used in handheld equipment or in applications such as CD/DVD drives.

Ricoh R5511x series is designed for a customer demanding a low dropout voltage regulator and a reset IC in one package with a wide range of design options. Ricoh R5511x has an embedded delay timer selectable in four different versions (1 ms, 20 ms, 60 ms or 240 ms), leaving no need for external capacitors. In addition, the designer can select for a hysteresis voltage of 5% of the (-V det) threshold voltage or none.

Ricoh R5511x comes in three packages varying from small to high wattage. These packages are SON6, SOT23-5 and SOT89-5. The 6-pin package type, SON6, has an external sense pin option allowing the designer to connect the sense pin according to his requirements to monitor a specific voltage level connected to the terminal. The output types available for the 6-pin package are N-Channel open drain or CMOS. As for the 5-pin package types SOT23-5 and SOT89-5, the designer can choose from two different versions, LDO input or LDO output monitoring. Both are available with an N-Channel open drain output.

Ricoh R5511x has a maximum output current of 300 mA and a fold back current limit protection for enhanced safety features. Supply current for the LDO regulator is 50 µA and for the voltage detector 1.5 µA (LDO regulator disabled). Furthermore, it is recommended to use ceramic capacitors with a minimum value of 1.0 µF.

R5511x Features

Low supply current	Typ. 50 µA (VR), Typ. 1.5 µA (VD)
Low standby current	Typ. 0.1 µA (VR)
High ripple rejection	Typ. 75 dB (f = 1 kHz) (VR)
Output current	Minimum 300 mA
High output voltage accuracy	±1.5% (V out 2.0 V, V det 2.0 V)
Low dropout voltage	Typ. 0.1 V (I out=100 mA) (VR)
Packages	SON6/SOT23-5/SOT-89-5
Ceramic capacitor recommendation	C in = C out = Ceramic capacitor 1 µF or more
Hysteresis	5% or none
Miscellaneous	Built-in current limit circuits (VR)